#!/usr/bin/env -S uv run python3
import tkinter as tk
from tkinter import N, S, E, W, ttk
import textwrap


# Complex transforms go here,
# Simple transforms are just lambdas
def _wordcount(s: str):
    "Returns a tuple of linecount, wordcount, charcount"
    return (len(s.splitlines()), len(s.split()), len(s))


def _markdown_quote(s: str):
    "Returns every line prefixed with >"
    return "\n".join(["> " + line for line in s.splitlines()])

transforms = [
        # Transforms go here, for example
        {"name": "One line", "transform": lambda x: " ".join(x.splitlines())}
        ,{"name": "Line/Word/Char", "transform": _wordcount}
        ,{"name": "Dedent", "transform": textwrap.dedent}
        ,{"name": "Markdown Quote", "transform": _markdown_quote}
        ]

class GUI():
    def __init__(self) -> None:
        self.root = tk.Tk()
        self.active_transform = lambda x: x # start with no transform
        self.layout_gui()


    def layout_gui(self) -> None:
        self.mainframe = ttk.Frame(self.root, padding="3 3 12 12")

        self.root.title("Text Tools")
        self.mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
        self.root.columnconfigure(0, weight=1)
        self.root.rowconfigure(0, weight=1)
        self.content_box = tk.Text(self.mainframe, undo=True)
        self.content_box.grid(column=2, row=2)

        self.output_box = tk.Text(self.mainframe, undo=True)
        self.output_box.grid(column=2, row=3)

        self.transform_box = tk.Listbox(self.mainframe)
        self.transform_box.grid(column=1, row=2, rowspan=2)
        for t in transforms:
            self.transform_box.insert(tk.END, t["name"])

        # Keyboard bindings
        self.root.bind("<Escape>", lambda _: self.root.quit())
        self.content_box.bind("<Tab>", lambda _: self.transform_box.focus())

        # vvv makes clicking or pressing enter change the transform
        self.transform_box.bind("<Button-1>", self.select_transform)
        self.transform_box.bind("<Return>", self.select_transform)

        # vvv makes anything typed in update the output
        self.content_box.bind("<Key>",
                              lambda _: self.root.after(1, self.update))

        self.content_box.focus()

    def update(self):
        content = self.content_box.get('1.0', tk.END)
        content = self.active_transform(content)
        self.output_box.delete('1.0', tk.END)
        self.output_box.insert('1.0', content)

    def select_transform(self, _):
        try:
            selection = self.transform_box.curselection()[0]
            self.active_transform = transforms[selection]["transform"]
            self.update()
        except (ValueError, IndexError):
            pass

def main(): # Entry point for pyproject.toml
    gui = GUI()
    gui.root.mainloop()

if __name__ == "__main__":
    main()